Focusing device.



R. KROEDEL.

FOGUSING DEVICE.

APPLIOATION FILED 00T. 5, 190e.

. 937,155 Patented o@1;.19,19o9.

lle

UNITED STATES PATENT OFFICE.

amies@ moesen, os-sceesme;alieeiiiifiieee et Koma' C0., 0F ROCHESTER,ironie A cbnroeafrr'ii Yk.

rocsird Device.

Patented ct.- 19, 19097.,

Application tiled October 5, im. Seriell o. 486146.

To all ahem: it fm1/y concern-5 Be it known that I, RoER'f'r Kromme', oV

My present invention relates to photog? raphfy and more jiarticularly tov photograpli'ic c'a-naeras and it has for its object to provide anifrnj'ntved focusing attachment that will accurately and convenientlydetermine' the pro' r relatiife positions of the movable parts t atenter into the focusingA aeration for focusing objects at 'variousdistances from thel'ens.

it further object of my invention is to arovi'de a device that will'offer advantages in' the' matterl of its attachment td the camerawhereby it may be easily and accurately tted to the requirements ofparticular lenses j To these andi other ends the invention consists incertain improvements and cornbinations of parts all as Will hehcreiHatterl more fully descrbed, the novel features bepoin'ted out inthe claires at the end of the speeii'cat'ion.

lin the drawings: Figure 1 is a side lelevation of a camera and of afocusing device attached thereto, constructed in accordance vvith' andillustrating one eifuhcdimeut ot niy invent-ion. Fig. 2 is a irontelevation thereof, the upper portion ot' the camera being broken avvay.Fig. 3' is a top plan view of the focusing devi'ces and ot' adjacentportions or the' ca'fiher'a bed. Fig. 45 is a bottonr pla'n viev'v ofthe fusing stop .de-

taclied, and Fig. is a transverse section substantially on tll'e line 5-5 of Fig. 3.

Similar reference numerals in the several figures indicate similarparts. o

'The camera' to which l have in the present instance shown i-ny im'rovements attached, is of the' Well knovvn olding pocket typeconprisilrgI a body portion- 1, front 2 and bel-leurs 3 connectingtheseV parts', the latter being liosed' Within the usual chamber e inthe body' when the camera is' reread. The chamber i5 is then closed by adoor 5y that foii'ns a hed when' open, for' the support of the fn't 2and is provided in the present instace, With vertically extending plates5 Having gfroves 6 on their adjacent sides that foi-rn a track runriingldngitudinally off the bed, and mounted o' the track i's a carriage 7saine the gebves' e, which carriage sufppert's the' liront 2.

To the side of ol'ie of the track plates 5* l s'eirre a plate or,bracket 8 that is made adjustable longitudinally thereof for pu'rposesthat vvil'l later appear. The securing 'means comprise in' the presentinstance a clainpi'fng plate 9 slidably engaging one side olf thesupporting ila-nge l0' ot the bracket and positioned on the latter hymeans or' nibs ll 'that engage' Within a slot- 12 in the.

said l'afnf're While screw bclts '13 threaded into the clamping plateextend through t-hc` slot and hear upon the opposite side of the trackplate.

The bracket is divided on its upper face at intervals with a series ofslots or openings '14, each having an adjacent index character 1:55, theunits oat the series bein-'g spaced or graduated to form a scale runningparallel die v'vith the track and hence with the path of movement di thecarriage 7. The latter is provided Withv an abutment 15 that traverse'sthe scale and in the present instance the' said abutment is formed by alaterally extending* arm 16 that projects over and a short distanceabove the bracket.

.lour'iialed ini downwardly extending ears 17 on tlie oracl'ret is arotary stop i8 having a knurle'd li'e'd l) at one endre'untyy for convei'xien'ee in turnii'ig;y and the body portion or which is formed by adrum having I a series of engaging j'iortio'ns Z0 projecting radiallytherefrom. These engaing portions are graduated axially of the drum tocorrespond with the giad'uation's ott' the scale so that each isadaptedy to coperate ivithy the latter by projecting through one' of theslots le adjace'llt an index character l5 and into the path of the'abutment 1".31 on the carriage and theyy are spaced relatively,eircu'lnferentially of the' drun in sucli manner that no tivo may lie inthe path of the said abutment at the saine time. To assist in centeringeach projection' in its operative position, tl'i'e head l@ of t'lie stop18 and one of its supporting ears l? are' provided with' coperatlg`depressed and projecting ortions .21 and 22 respectively. The c 'et 8may carry a steatifyi'ng pinI 23 at its outer edge if desired libe tobear against the bed and prevent occasional strains from being bornewholly by the attaching devices on the track.

The index characters 15 are usually given in units of distance and thedevice as a whole is applied to the camera after suitable tests in suchposition that the reading of the abutment 15u on the scale will indicatethe distance from the lens at which the object will be properly focused.To prepare the instrument for an exposure, the operator, with the aid ofmy improvements, has therefore simply to rotate the stop 18 until theproper projection 20 registers with the character 15 that correspondswith the estimate he has made of the distance of his object and to pullout his carriage, whereupon the latter will automatically stop throughenagement of the abutment 15EL therewith at t e required pointeofadjustment.

As different lenses of the same s ecifications often ditfer slightly infocal istance and there are a t to be other variations in the relationsofp the parts during the construction of the camera that will producethe same result, the focusing device, to bring about the best results,must be positioned by test and it is for this reason that the bracket 8is adjustably mounted on the track, as

reviously described, where its position can e altered throughmanipulatlon of the bolts 13.

It will, of course, be understood that the focusing devices may beapplied in substantially the same manner in cameras in which thefocusing is done through the relative movement of a fixed lens carryingfront and a movable sensitized material orvscreen carrying body insteadof the reverse, as herein s own. Moreover, as the coperating elements onthe carriage or front and the camera bed combine to indicate and controlthe relative movement and adjustment of these parts, it is obvious thatsubstantially iden tical results would be accom lished in substantiallythe same manner y interchanging the locations of the said elements, asherein shown, all without departing from the s irit of my invention.

I c aim as my invention:

1. In a focusing device, the combination with a camera bed and acarriage movable thereon, one of said members being provided with anabutment, of a graduated scale on the other and a movable stop coperatinl with the scale and adapted to be engage( by the said abutment, thescale being adjustable on the member in the direction of movement of thecarriage.

2. In a focusing device; the combination with a camera bed and acarriage movable thereon, one of said members being provided with anabutment, of a scale graduated in units of focal distance adjustable onthe other and a movable stop carried by and cooperating with the scaleand adapted to be engaged by the abutment on the first men-l tionedmember.

3. In a focusing device, the combination with a camera bed having atrack thereon and a carriage movable on the track and provided with anabutment, of a graduated scale adjustable longitudinally of and mountedon the track and a movable stop carriedby and coperating with the scaleand adapted to be engaged by the abutment on the carriage.

4. In a focusin device, the combination with a camera d, a carriagemovable thereon, one of said members being provided with an abutment anda graduated scale on the other, of a stop having a series of engagingportions, each unit of the series being movable into direct registerwith a graduation of the scale and into the path of the abutment.

5. In a focusin device, the combination with a camera be and a carriagemovable thereon, one of said members being provided with an abutment, ofa rotary stop on the other having a plurality of engagln portions spacedrelatively to each other 1n the direction of movement of the carriageand movable, selectively, into the path of the abutment through rotationof the sto 6. In a focusln device, the comblnation with a camera bed anda carriage movable thereon, one of said members being rovided with anabutment, of a scale on t e other, a rotary stop supported thereon andhaving a series of engaging portions spaced ,relatively to each other inthe direction of movement of the carriage and movable, selectively, intothe path of the abutment through rotation ofthe stop,the said stop andits support being provided with coperating projecting and epressedportions for centering the positions of the engaging portions of thestop.

7. In a focusin device, the combination with a camera be and a carriagemovable thereon, one of said members being provided with an abutment, ofa rotary Adrum on the other having its axis parallel with the path ofmovement of the carriage and provided with a plurality of radialprojections, spaced axially and circumferentlally thereof, eachprojection being movable with the rotation of the drum into the path ofthe said abutment. I

8. In a focusin device, the combination with a camera be and a carriagemovable thereon, one of said members being provided with an abutment, ofa scale carrled on the other and comprisin rality of o emngs t ere1n,the plate being so arrange relatively to the other member as to betraversed by .the abutment there- 'ournaled beneath on, and a rotarydrum j the plate-and having a p urality of projeca plate having a plu--tions thereon adapted to extend successively through the opemngs in theplate and into the path of the abutment on the carriage as lthe drum isrotated.

9. In a. focusing device, the combination with-a camera be and acarriage movable thereon, one of said members being provided with anabutment, ofva movable stop supported on the' other to engage theabutment l0 and adjustable relatively to its support to halt theYcarriage at diierent points on the bed, the stop and its support beingprovided ROBERT KROEDEL.

Witnesses:

` Rossum. B. GRIFFITH,

LUCY A. VAN COURT.

